Finding the Fourth Proportional to 1,745.21, 2,615.59 and 818.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,745.21 : 2,615.59 = 818.72 : x
2. Step 2: Convert to fraction form
   1,745.21/2,615.59 = 818.72/x
3. Step 3: Cross multiply
   1,745.21x = 2,615.59 × 818.72
4. Step 4: Simplify right side
   1,745.21x = 2,141,448.31
5. Step 5: Solve for x
   x = 2,141,448.31/1,745.21
6. Step 6: Final answer
   x = 1,227.04